That's not an Identity!

If xx and yy are positive integers, and satisfy

(x+y)!=x!+y!(x+y)!=x!+y!

Find xx and yy. Enter x+yx+y as your answer.

Notation: !! is the factorial notation. For example, 8!=1×2×3××88! = 1\times2\times3\times\cdots\times8 .

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